The Aussie midfielder is determined to bounce back from the double whammy of missing out on this summer's World Cup finals and requiring an operation which has prevented him showing the new Hoops manager what he can bring to his team.
The adductor muscle injury which restricted Rogic's appearances for Melbourne Victory - where he was sent on loan in January - and, ultimately, cost him his spot in the Oz squad which travelled to Brazil forced him under the knife when he returned to Scotland a fortnight ago.
Rogic has since been joined on the Hoops' rehab list by skipper Scott Brown and winger James Forrest. But, unlike the two first-team regulars, he has still to provide Deila with any real archive evidence of why he should be in his plans.
The man who replaced Neil Lennon as boss has shown a penchant for giving young players the opportunity to impress. And this is only serving to add to Rogic's frustration that he is unable to show the manager what he has to offer and begin to make up for the time lost during his 18 months as a Celtic player.
He said: "It's been ongoing, a pretty common injury for players. I'm very confident I'll bounce back and be fine. The injury was restricting me too much.
"Towards the end, it was difficult to get around the pitch, let alone do the things I wanted to do."
Despite his setbacks, the 21-year-old is trying hard to remain philosophical and positive as he begins the road back to full fitness, which is expected to last for another month at least.
He had attempted to avoid surgery, but, after losing out when the Aussie World Cup squad was cut from 26 to 23, eventually had to concede it was the only way to resolve the issue which was proving such a handicap.
But he has come to terms with missing out, and said: "It wasn't to be, but it's behind me now and I'll look forward to the future."
Rogic accepts he still has much to prove following his £400,000 move to Celtic.
But, with his surgery behind him, he now hopes to be able to go all out to impress the new manager.
"Injuries happen in football," said Rogic. "It's about how you deal with it and bounce back from it. That's the most important thing, and I'm confident for the future."
Short term, Rogic has his sights set on getting back to full fitness and winning a place in the Celtic side.
Longer term, he is already aiming to regain his international place and be part of the next World Cup finals, in Russia in 2018.
Next year's Asia Cup, to be staged in Australia, would be a big stepping stone towards this as the Aussie side is rebuilt following their Group Stage exit in Brazil.
But, Rogic has learned not to plan too far ahead, and said: "Four years ago I was the bloke from Canberra who never got picked for anything.
"Things change quickly, and I'm grateful for the position I'm in.
"Four years is a long time, but of course I hope to be there next time."